This Friday, in association with Aldeburgh Music, the Guardian will stream live from Snape Maltings a children's celebration of folk songs reinterpreted in exciting ways by today's leading composers, including Rachel Portman, Nico Muhly, Jason Yarde, Sally Beamish and Talvin Singh

From scoring Oscar-winning films to helping out Björk, Nico Muhly is in demand all over the globe – and he's still only 29. The US composer tells Tom Service why his first opera is based on a Manchester knife attack